let a = [
    {
        "x": "A",
        "y": "AAA",
        "qty": 5,
        "mmt": 4,
        "mmtAll": 4,
        "ratio": 125.00,
        "fillPer": 0.48
    },
    {
        "x": "A",
        "y": "AAB",
        "qty": 11,
        "mmt": 8,
        "mmtAll": 8,
        "ratio": 137.50,
        "fillPer": 0.49
    }
]

let b = [
    {
        "panelId": "A",
        "topLeftX": -200,
        "topLeftY": 300,
        "bottomRightX": 0,
        "bottomRightY": 100,
        "panelInfos": [
            {
                "panelId": "AA",
                "topLeftX": -200,
                "topLeftY": 300,
                "bottomRightX": -150,
                "bottomRightY": 250,
                "ratio": 0.2
            }]
    }]
把数组b的panelInfos的每一项，新增一个数组a的fillPer字段，取值是数组a的fillPer字段，他们的对应关系是panelInfos里每一项的panelId和a里面的y字段去除第一个字符串以后的值相等